Mathematical claim confusing for elite maths master? Not I (7,4,7)

I believe the answer is:

fermats last theorem

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'mathematical claim confusing for elite maths master? not i' is the definition.
I can't judge whether this definition defines the answer.

'confusing for elite maths master? not i' is the wordplay.
'confusing' indicates an anagram.
'not' is a deletion indicator.
'for'+'elite'+'maths'+'master'='forelitemathsmaster'
'forelitemathsmaster' with 'i' taken out is 'foreltemathsmaster'.
'foreltemathsmaster' anagrammed gives 'FERMATS LAST THEOREM'.

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I've seen this clue in The Independent.

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